TOEFL implacable Definition Impossible to calm down or satisfy; unrelenting. Example "She faced the implacable opposition of her neighbors." Sign in to save TOEFL Quiz → ← impious implant → Study tips featuring "implacable" Map Each Word Into a Connected Network Track How TOEFL Words Behave With Others Group TOEFL Words Around Academic Themes Related words TOEFL brighten GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze